Patent GB-930238-A (GB)
Title: Improvements in or relating to multicolour automatic looms
IPC: D03D45/20
Filed: 1960-09-09
Abstract: 930,238. Automatic bobbin changing in looms; stop motions. MASCHINENFABRIK RUTI A.G. Sept. 9, 1960 [Sept. 11, 1959], No. 31215/60. Class 142 (2). Bobbin changing, Fig. 1.- When bobbin changing is initiated, one of four levers 3 swings about a shaft 2 to rock the flap 6b of the appropriate compartment 7 of the magazine, thereby allowing a bobbin to drop on to a channel 9. Each lever 3 carries a pivoted draw hook 46 which can be brought by control mechanism 19 into the path of a continuously oscillating draw knife 16, whereby the lever 3 is operated. The operated lever 3 encounters the end 8a of a lever 8 and turns the lever so that a pusher 8d sweeps along the channel 9 to push the released bobbin into position under the transfer hammer 14. The gap between the end 11 of the channel and a fixed wall 13 is smaller than the diameter of the bobbin but, when the hammer 14 operates, the channel 9 is displaced about a pivot 10 to allow the bobbin to pass into the shuttle. Stop motions, Fig. 1.-The draw knife 16 is actuated by linkage 22, 20a, 17, which incorporates a give-way device 20; if movement of the knife is obstructed, the device 20 yields and stops the loom through a Bowden cable 21. Since the draw knife also provides the drive for the pusher 8, the stop motion operates if the pusher is unable to complete its stroke owing to a bobbin becoming jammed in the channel 9 or to two bobbins being present at the same time. When the stop motion operates, the transfer hammer 14 is kept out of action by means of linkage 23, 25 coupling the lever 8 to an arm 30 carrying a roller 31. The roller normally supports the rail 32a of the dog 32 by which the hammer 14 is actuated. When the lever 8 performs a complete swing, the roller is moved to the position shown in broken line, whereupon a spring 33 lifts the dog 32 into position for engagement by a striker 34 on the sley; if the lever 8 fails to complete its swing, the roller 31 remains under the tail of the dog, so that the hammer is not operated. The same action occurs if a shuttle feeler 27 carried by a lever 24 is obstructed by an incompletely boxed shuttle. It is also stated that a stop motion operates if the channel 9 is forced back further than usual during transfer. Finding weft end, Fig. 3.-A tip bunch remover energized by a vacuum pipe 250 is carried by an arm 247 fixed to a shaft 246, journalled on the loom frame. A casing 245 also fixed on the shaft houses a plunger 240 which is normally kept retracted as shown by toggle links 238, 242. When bobbin changing is initiated, a connection 136 from the pusher 8 (Fig. 1) collapses the toggle, allowing a spring 244 to project the plunger 240 into the path of a plate 222 mounted on the slay 220. As the slay moves forward, a cam slot in the plate 222 embraces the plunger and imparts an oscillation to the shaft 246, causing the tip remover 248 to move on to the bobbin that is in readiness under the transfer hammer and withdraw its tip bunch. When the action is completed, a striker 241 on the plate 222 rocks the toggle link 238 to its normal position, thereby retracting the plunger 240 and resetting the toggle.